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Seismic risk analysis of concrete pipelines
Seismic risk analysis of an existing pipeline and a new pipeline is performed considering the effects of vertical acceleration, wave propagation, and permanent ground displacement. Vertical acceleration increases gravity and the circumferential stresses in the pipe wall. It can impact the design of the pipe and increase the risk of structural failure of existing pipelines. Seismic waves result in longitudinal effects in pipe and increases the risk of failure form crushing of concrete, disengagement of unrestrained pipe joints, and the fracture of the embedded steel cylinder at restrained joints. These risks are much greater near the bends, where the pipeline has restrained joints, at soil-to-rock transitions, and at connections to large structures. A detailed finite-element model is presented for analysis of bends in concrete pipelines accounting for tensile softening and cracking of concrete in tension. Permanent ground displacement due to consolidation, and slope instability and lateral displacement resulting from loss of soil shear strength when subjected to dynamic shear strain, also increases the risk of pipeline failure. Fragility curves are developed for each of the potential failure modes of the pipeline, and are combined with the seismic hazard curves to calculate the probabilistic seismic risk of pipeline failure.
Seismic risk analysis of concrete pipelines
Seismic risk analysis of an existing pipeline and a new pipeline is performed considering the effects of vertical acceleration, wave propagation, and permanent ground displacement. Vertical acceleration increases gravity and the circumferential stresses in the pipe wall. It can impact the design of the pipe and increase the risk of structural failure of existing pipelines. Seismic waves result in longitudinal effects in pipe and increases the risk of failure form crushing of concrete, disengagement of unrestrained pipe joints, and the fracture of the embedded steel cylinder at restrained joints. These risks are much greater near the bends, where the pipeline has restrained joints, at soil-to-rock transitions, and at connections to large structures. A detailed finite-element model is presented for analysis of bends in concrete pipelines accounting for tensile softening and cracking of concrete in tension. Permanent ground displacement due to consolidation, and slope instability and lateral displacement resulting from loss of soil shear strength when subjected to dynamic shear strain, also increases the risk of pipeline failure. Fragility curves are developed for each of the potential failure modes of the pipeline, and are combined with the seismic hazard curves to calculate the probabilistic seismic risk of pipeline failure.
Seismic risk analysis of concrete pipelines
Rao, R.S. (author) / Zarghamee, M.S. (author)
1999
13 Seiten, 15 Quellen
Conference paper
English
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